擅长:python、mysql、java
<p>必须先在Readers表中创建writer_id,然后再将其设置为外键。在</p>
<pre><code>cHandler.execute( "CREATE TABLE Readers(Id INT PRIMARY KEY AUTO_INCREMENT, Writer_id INT ) ")
cHandler.execute( "alter table Readers
add foreign key (Writer_id)
references Writers(Id)")
</code></pre>